Apparatus for effecting a continous crystallization from solutions.



LHANSEN. y `MPIRATUSI'FUB FF-EIC'TING A CONTINUOUS CRYSTALUZTION FROMSOLUTIONS.

Arme/mou mso SEPT. a. 1915.

Patented July 16, 1918.

.nifl-n.1.

teeeee ee EINAR HANSEN, OF RJUKAN, NORWAY, A'ASSIC'I'NOB T0 NORSKHYDRO-E LEKTRISK KVAELSTOFAKTIESELSKAB, 0F CHBISTIANIA, NORWAY.

Arrana'rusron ErrEc'rINe A CONTINUOUS cnYs'rALnIzA'rIoN Enom soLu'rIoNs.

To all whom t may concern: j

Be it known that I, EINAR -HANsEN, a

"subject of the King of Norway, residing .at Rjukan', Norway, .haveinvented certa-in new and useful Improvements in Appara- `to spurVgears'and'1s provided at its ends tus for Ei'ecting a ContinuouslCrystallization from Solutions; and 1 do hereby de-l clare the followingto be a full, clear, and

exact description of the invention, such as will enable others skilledin the art to which *it appertains to make and use the same, referencebeing had to the accompanylng drawings, and to letters or figures ofreference marked thereon, which form a part of this specification.

This invention ratus for effecting a continuous crystallization fromsolutions.

Various constructions of apparatus have been proposed for the purpose ofeiecting while maintaining the solution in motion. Thus forthis purposeone has employed the socalled rocking pans, which are maintained in-grocking motion during `lthe crystallization so that the precipitatedcrystals are moved alternately toward one sideandV Further it has beenproposed, to maintain` the mass in motion duringthe crystallization by'means of rotating or oscillating 'stirrera The crystallizer constructedaccording to the present filvention dii'er's from 4other knowncrystallizers Vby being of a very simple construction as well asiregards' the whole arrangement as also with regard to the mechanism forimparting the necessary motion to the apparatus andto the means foreffecting the cooling ofthe apparatus.

Anembodim'ent of the invention is illus;

trated in Athe accompanying drawing in which Figure l is adiagrammatical side view of an apparatus constructed in accordance withthe invention.

Fig. 2 is an end view of the apparatus.

The crystallizer vessel consists of acylinder 1 which occupies aninclined position and which is quite open at the lower end at 2, whileat the upper end it is in part closed by means offa wall 3.. IThis wallhas a central opening through which the supply pipe-L-for the saturatedsolution is passed into the vessel. Below the lower end of the cylinderis provided a funnel 5 has for its object an appa- Specification ofLetters Patent. Patented July 16, 1918.

Application led September 3,v 1915. Serial 110.48385.

into'which the crystal mass iows Iand from which'. it is transferred tocentrifugal machines or'v other apparatus, where the crystals areseparated from the mother liquor. The cylinder rests on rollers 64connected with toothed rims 7 engaged by said spur gears. The rim at theupper end engages a toothed wheel 8 on the shaft 9 therotationV of whichcausesthe cylinder to rotate about its own axis. Q l

Above the cylinder 1 is provided a perforated pipe 10 for coolingwater,which is sprayed over the outer surface' ofthe cylinder, iows down alongthisflatter and is taken up into a stationary tray 11, provided ywithoutlet 12. Above and below that part of the cylinder, where the waterfrom the pipe 10 flows on to the Vcylinder,'c'ollars 13 and 14 areprovided, which prevent cooling water from flowing outside of the tray411.

lDuring the operation the crystallizer cylin- -just the bar by. asuitable handle.

The concentrated Vsolution is continu- `ou`sly supplied nthrough theApipe 4, the

vso

quantity supplied being regulated by means of 'a cock' 15. On itspassage through the' cylinder the solution will move along a yhelicalpath on the'cooledvinterior Wall of thecylinder toward the discharge opeing 2. The inclination and the velocity of he cylinder, which should beadjustable are in each case so adjusted in accordance with the characterof the treated solution. that the crystallization `process is finishedwhen the mass reaches the discharge end ofthe cylinder. If it is foundsuitable the inner wall 'of the cylinder may be provided with annularintermediary walls .which to a certain degree effects a retardation efthe motion of the mass toward the outlet. Such a wall may also bearrangedv at the outlet end of 'the cylinder. The su ply-of coolingfluid tothe surface ofthe cylinder may also'be i fluid. f v nclaim:

`effected in other manners than illustrated 1tor instance nya partialimmersion' of the cylinder intoa vessell containing the cool- 1..Apparatus for 'ellecting continuous crystallization, comprising aninclined, cylindrical crystalliz'er vessel, means to rotate the same,means to continuously supply Inaterial toits upper end; meanscontinuously discharging from' it lower end, means to supply a coolingsprayexteriorlyof the Vessel means below said vessel 4to collect anddischarge the cooling medium,A a scraper mounted in the vessel andadjustable with respect to the interior thereof. v

2. lA paratus for eHecting continuous crystal ization, comprising aninclined, cy-

lindrical crystallizing vessel, means to ro-` tate the. same, means tocontinuously supply material to the upper end of said "vessel,l

dium, an adjustable shaft in said vessel and a scraper hung froml saidshaft and adjusted therebywith respectto the interior surface of-saidvessel.

In testimonythat I Aclaim the foregoing' as my invention, I have signedmy name in presence of two subscrlblng witnesses.

EINAR HANSEN.

Witnesses:

M. E. GUTHORMSEN, THS. HEIG.

